Calcium Modul with B600 blocking filter - 1.25'' in Star diagonal with T2 connection Internal narrowband filters allow for a <2.4 Angstrom bandpass. Primarily an imaging system due to the difficulty of many to visually see everything that CaK has...

Calcium Modul with B1200 blocking filter - 1.25'' Star diagonal with T2 connention Internal narrowband filters allow for a <2.4 Angstrom bandpass. Primarily an imaging system due to the difficulty of many to visually see everything that CaK has...

Calcium Modul with B1800 blocking filter - 1.25'' in extension tube with T2 and 2'' connection Internal narrowband filters allow for a <2.4 Angstrom bandpass. Primarily an imaging system due to the difficulty of many to visually see everything...

Calcium Modul with B3400 blocking filter - 2'' extension tube with T2 and 2'' connection Internal narrowband filters allow for a <2.4 Angstrom bandpass. Primarily an imaging system due to the difficulty of many to visually see everything that CaK...